Thanks, Peter. However, this is not quite what I want, and I apologize
if my question was not clear.
What I want to do is leverage work already done to validate the XForms
instance. I do not want to rewrite in XPath all the rules already
created with XML Schema types, constraint attributes, and required
attributes: this would be painful and error-prone code duplication. I
really want the valid and required properties to be leveraged.
-Erik
Kisuule, Peter wrote:
> 1. Place your button in a group like this..
>
> <xf:group bind="enableButton">
> <xf:trigger ......>
> .........
> </xf:trigger>
> </xf:group>
>
> 2. In the model create a bind like this....
>
> <xf:instance id="temp">
> <tempData>
> <SubmitButton/>
> </tempData>
> </xf:instance>
>
> <xf bind id="enableButton" nodeset="instance('temp')/SubmitButton"
> relevant="calculate (field1... has data and field2 has data ....) />
>
> When relevant is "true" the button will show up and it will vanish when relevant is false. This is what Model Based Switching is all about
>
>
> Peter
>
>
> -----Original Message-----
> From: www-forms-request@w3.org [mailto:www-forms-request@w3.org]On
> Behalf Of Erik Bruchez
> Sent: Tuesday, October 25, 2005 11:32 AM
> To: www-forms@w3.org
> Subject: Disabling a button based on validity
>
>
>
> All,
>
> I am having trouble figuring out the solution to an extremely basic UI
> requirement: disabling a submit button, implemented either with
> xforms:submit or xforms:trigger, until certain fields have been filled
> out correctly by the user.
>
> Of course, you could leave the button always enabled. Upon XForms
> submission, if the submitted instance is not valid or has missing
> required fields, submission will fail, throw an xforms-submit-error,
> and you can notify the user of the failure. But from a usability
> perspective, this is usually a bad solution.
>
> So these are my questions:
>
> 1. How do people address this UI requirement today with XForms? Is
> there a way of doing this purely based on the XForms 1.0
> specification? If not, are there workarounds? For example, we have
> played with counting xforms-valid and xforms-invalid events,
> clearly a quite heavy solution.
>
> 2. If the answer to #1 above is "no" or "here is a way, but it's
> really a dirty hack":
>
> 2.1. Is the WG working on addressing this? (I should talk with
> Sebastian but it doesn't hurt to ask this publicly.)
>
> 2.2. Are there extensions suggested or implemented by existing
> XForms engines that address this?
>
> Thanks,
>
> -Erik
>
>
>
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